1221122211201 has 16 divisors (see below), whose sum is σ = 1867427038720. Its totient is φ = 787820780880.

The previous prime is 1221122211109. The next prime is 1221122211233. The reversal of 1221122211201 is 1021122211221.

It is not a de Polignac number, because 1221122211201 - 2¹⁸ = 1221121949057 is a prime.

It is a super-2 number, since 2×1221122211201² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221122211241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 729462850 + ... + 729464523.

It is an arithmetic number, because the mean of its divisors is an integer number (116714189920).

Almost surely, 2^{1221122211201} is an apocalyptic number.

It is an amenable number.

1221122211201 is a deficient number, since it is larger than the sum of its proper divisors (646304827519).

1221122211201 is a wasteful number, since it uses less digits than its factorization.

1221122211201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1458927413 (or 1458927407 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 1221122211201 its reverse (1021122211221), we get a palindrome (2242244422422).

The spelling of 1221122211201 in words is "one trillion, two hundred twenty-one billion, one hundred twenty-two million, two hundred eleven thousand, two hundred one".